package com.heima.interceptor;


import com.heima.constant.JwtClaimsConstant;
import com.heima.context.BaseContext;
import com.heima.properties.JwtProperties;
import com.heima.util.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;


/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
@RequiredArgsConstructor
public class JwtTokenInterceptor implements HandlerInterceptor {

    private final JwtProperties jwtProperties;

    @Override
    public boolean preHandle(HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response, Object handler) throws Exception {
        // 判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            // 当前拦截到的不是动态方法，直接放行
            return true;
        }
        // 1 从请求头中获取令牌
        String tokenWithBearer = request.getHeader(jwtProperties.getTokenName());
        String token = tokenWithBearer.replace("Bearer ", "");

        // 2 校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getSecretKey(), token);
            // 将当前用户 id 以及 username 放入到 BaseContext 中
            BaseContext.setData(JwtClaimsConstant.USER_ID, claims.get(JwtClaimsConstant.USER_ID));
            BaseContext.setData(JwtClaimsConstant.USERNAME, claims.get(JwtClaimsConstant.USERNAME));
            // 3 通过，放行
            return true;
        } catch (Exception ex) {
            // 4 不通过，响应 401 状态码
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response, Object handler, Exception ex) throws Exception {
        BaseContext.clear();
    }
}
